source: libcaca/trunk/tools/sortchars.c @ 1841

Last change on this file since 1841 was 1841, checked in by Sam Hocevar, 15 years ago
  • Updates to sortchars.c so that it can output a proper LUT.
  • Property svn:keywords set to Id
File size: 4.6 KB
Line 
1/*
2 *  sortchars     analyse ASCII characters
3 *  Copyright (c) 2007 Sam Hocevar <sam@zoy.org>
4 *                All Rights Reserved
5 *
6 *  $Id: sortchars.c 1841 2007-10-22 10:15:54Z sam $
7 *
8 *  This program is free software. It comes without any warranty, to
9 *  the extent permitted by applicable law. You can redistribute it
10 *  and/or modify it under the terms of the Do What The Fuck You Want
11 *  To Public License, Version 2, as published by Sam Hocevar. See
12 *  http://sam.zoy.org/wtfpl/COPYING for more details.
13 */
14
15#include "config.h"
16#include "common.h"
17#if !defined(__KERNEL__)
18#   if defined(HAVE_INTTYPES_H)
19#      include <inttypes.h>
20#   endif
21#   include <stdio.h>
22#   include <string.h>
23#   include <stdlib.h>
24#endif
25#include "cucul.h"
26
27#define GLYPHS 0x7f
28#define FONT 1 /* 0 or 1 */
29#define DX 2
30#define DY 3
31#define RANGEBITS 2
32#define RANGE (1 << RANGEBITS)
33#define FULLRANGE (1 << (RANGEBITS * DX * DY))
34
35int total[GLYPHS][DX][DY];
36int16_t allbits[GLYPHS];
37int bestchar[FULLRANGE];
38
39static int curve[17] = /* 17 instead of 16 */
40{
41    0, 4, 6, 8, 9, 10, 11, 12, 12, 13, 13, 14, 14, 15, 15, 15, 15
42};
43
44static int distance(uint16_t, uint16_t);
45
46int main(int argc, char *argv[])
47{
48    int count[DX][DY];
49    char utf8[7];
50    cucul_canvas_t *cv;
51    cucul_font_t *f;
52    char const * const * fonts;
53    uint8_t *img;
54    unsigned int w, h, x, y;
55    int ret, i, max;
56
57    /* Load a libcucul internal font */
58    fonts = cucul_get_font_list();
59    if(fonts[FONT] == NULL)
60    {
61        fprintf(stderr, "error: libcucul was compiled without any fonts\n");
62        return -1;
63    }
64    f = cucul_load_font(fonts[FONT], 0);
65    if(f == NULL)
66    {
67        fprintf(stderr, "error: could not load font \"%s\"\n", fonts[0]);
68        return -1;
69    }
70
71    cv = cucul_create_canvas(1, 1);
72    cucul_set_color_ansi(cv, CUCUL_WHITE, CUCUL_BLACK);
73
74    /* Create our bitmap buffer (32-bit ARGB) */
75    w = cucul_get_font_width(f);
76    h = cucul_get_font_height(f);
77    img = malloc(4 * w * h);
78
79    /* Zero our structures */
80    for(y = 0; y < DY; y++)
81        for(x = 0; x < DX; x++)
82            count[x][y] = 0;
83
84    for(y = 0; y < h; y++)
85        for(x = 0; x < w; x++)
86            count[x * DX / w][y * DY / h]++;
87
88    for(i = 0x20; i < GLYPHS; i++)
89        for(y = 0; y < DY; y++)
90            for(x = 0; x < DX; x++)
91                total[GLYPHS][x][y] = 0;
92
93    /* Draw all glyphs and count their pixels */
94    for(i = 0x20; i < GLYPHS; i++)
95    {
96        cucul_put_char(cv, 0, 0, i);
97
98        /* Render the canvas onto our image buffer */
99        cucul_render_canvas(cv, f, img, w, h, 4 * w);
100
101        for(y = 0; y < h * DY; y++)
102            for(x = 0; x < w * DX; x++)
103                total[i][x / w][y / h]
104                  += img[(w * (y / DY) + (x / DX)) * 4 + 1];
105    }
106
107    /* Compute max pixel value */
108    max = 0;
109    for(i = 0x20; i < GLYPHS; i++)
110        for(y = 0; y < DY; y++)
111            for(x = 0; x < DX; x++)
112            {
113                int val = total[i][x][y] * 256 / count[x][y];
114                if(val > max)
115                    max = val;
116            }
117
118    /* Compute bits for all glyphs */
119    for(i = 0x20; i < GLYPHS; i++)
120    {
121        int bits = 0;
122
123        if(i >= 0x7f && i <= 0x9f)
124        {
125            allbits[i] = 0;
126            continue;
127        }
128
129        for(y = 0; y < DY; y++)
130        {
131            for(x = 0; x < DX; x++)
132            {
133                int t = total[i][x][y] * 16 * 256 / (count[x][y] * max);
134                bits *= RANGE;
135                bits |= curve[t] / (16 / RANGE);
136            }
137        }
138
139        allbits[i] = bits;
140    }
141
142    /* Find a glyph for all combinations */
143    for(i = 0; i < FULLRANGE; i++)
144    {
145        int j, mindist = 0x1000, best = 0;
146
147        for(j = 0x20; j < GLYPHS; j++)
148        {
149            int d = distance(i, allbits[j]);
150            if(d < mindist)
151            {
152                best = j;
153                mindist = d;
154                if(d == 0)
155                    break;
156            }
157        }
158
159        bestchar[i] = best;
160    }
161
162    /* Print results */
163    printf("/* Generated by sortchars.c */\n");
164    printf("static char const lookup_ascii[%i] =\n{\n    ", FULLRANGE);
165    for(i = 0; i < FULLRANGE; i++)
166    {
167        ret = cucul_utf32_to_utf8(utf8, bestchar[i]);
168        utf8[ret] = '\0';
169        printf("%i, ", bestchar[i]);
170        if((i % 16) == 15 && i != FULLRANGE - 1)
171            printf("\n    ");
172    }
173    printf("\n};\n");
174
175    cucul_free_canvas(cv);
176
177    return 0;
178}
179
180static int distance(uint16_t a, uint16_t b)
181{
182    int i, d = 0;
183
184    for(i = 0; i < DX * DY; i++)
185    {
186        int x = (int)(a & (RANGE - 1)) - (int)(b & (RANGE - 1));
187        d += x * x;
188        a /= RANGE;
189        b /= RANGE;
190    }
191
192    return d;
193}
194
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